Best free database MCP servers: tested agent tools and MCP servers

As of 2026-10-22, TestedMCP tested 17 database MCP servers; 1 free server scored 100/100 and 5 deprecated servers are listed below under "Don't use".

Last tested 2026-10-22 · How we test

Managed database hosting has no verified affiliate program, so this page has no affiliate links. Maintained Postgres and Redis servers are now tested; most aren't ranked here yet because their pricing hasn't been verified (see 'Also tested').

Free labels are assigned by hand as of 2026-10-22 and haven't yet been re-checked against vendor pricing pages.

Ranked free options

Rank	Server	Free label	Score	Install	Handshake	Maintenance	Docs	License	Tools	Last tested	Install
1	MongoDB (official) repo	Free, no key to start (needs your own DB connection)	100	pass (20)	pass (30)	pass (25)	pass (15)	pass (10)	27	Last tested 2026-10-22	`npx -y mongodb-mcp-server`
2	Supabase (official) repo	Free with account	60	pass (20)	auth-gated (5)	pass (25)	fail (0)	pass (10)	not listed without credentials	Last tested 2026-10-22	`npx -y @supabase/mcp-server-supabase`

Notes on each server

1. MongoDB (official)

MCP initialize + tools/list over stdio succeeded with no credentials; 27 tools listed in 9.9s. Repo pushed 0 days before test; 1,148 GitHub stars. Apache-2.0 (OSI-approved).

2. Supabase (official)

Auth-gated: without credentials the server only printed a missing-credential message and did not list tools ("Please provide a personal access token (PAT) with the --access-token flag or set the SUPABASE_ACCE"). Not tested with real credentials; not counted as working. Repo pushed 0 days before test; 2,968 GitHub stars. Apache-2.0 (OSI-approved).

Also tested (not ranked: pricing not yet verified)

ClickHouse (official): score 100, handshake pass, Last tested 2026-10-22
Redis MCP (official, Redis): score 100, handshake pass, Last tested 2026-10-22
Neo4j Cypher (official): score 90, handshake pass, Last tested 2026-10-22
PostgreSQL MCP (HenkDz): score 80, handshake pass, Last tested 2026-10-22
SQLite (npx): score 80, handshake pass, Last tested 2026-10-22
mcp-redis (npm): score 75, handshake pass, Last tested 2026-10-22
MotherDuck / DuckDB (official): score 70, handshake fail, Last tested 2026-10-22
Upstash (official): score 65, handshake auth-gated, Last tested 2026-10-22
Postgres MCP Pro (Crystal DBA): score 60, handshake fail, Last tested 2026-10-22
MySQL: score 60, handshake fail, Last tested 2026-10-22

Don't use

Redis (legacy reference) (@modelcontextprotocol/server-redis), score 75: npm says Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.. Replacement: none identified.
Postgres (legacy reference) (@modelcontextprotocol/server-postgres), score 70: npm says Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.. Replacement: none identified.
SQLite (legacy reference, Python) (mcp-server-sqlite), score 45: npm says . Replacement: none identified.
Neon (official) (@neondatabase/mcp-server-neon), score 45: npm says This package is deprecated. Use the remote MCP server at mcp.neon.tech instead. See https://neon.tech/docs/ai/neon-mcp-server for more details.. Replacement: none identified.
Elasticsearch (official) (@elastic/mcp-server-elasticsearch), score 45: npm says This package is deprecated. Please see the README at https://github.com/elastic/mcp-server-elasticsearch for details on how to run v0.4.0 or later.. Replacement: none identified.

When to upgrade to a paid option

None needed for most users. No paid option is recommended here.

FAQ

What is the best free database MCP server?

MongoDB (official) ranks first with a TestedMCP score of 100/100 (tested 2026-10-22). Ties are broken by GitHub stars; affiliate status is never used.

Do I need an API key?

MongoDB (official): no key needed for the MCP handshake; Supabase (official): yes, credentials needed before it lists tools. A working handshake without a key doesn't mean the backing service is free.

Is Elasticsearch (official) deprecated?

Yes. Status: "This package is deprecated. Please see the README at https://github.com/elastic/mcp-server-elasticsearch for details on how to run v0.4.0 or later." (tested 2026-10-22).

Is Neon (official) deprecated?

Yes. Status: "This package is deprecated. Use the remote MCP server at mcp.neon.tech instead. See https://neon.tech/docs/ai/neon-mcp-server for more details." (tested 2026-10-22).

Is SQLite (legacy reference, Python) deprecated?

Yes. Status: "GitHub repo archived" (tested 2026-10-22).

Is Postgres (legacy reference) deprecated?

Yes. Status: "Package no longer supported. Contact Support at https://www.npmjs.com/support for more info." (tested 2026-10-22).